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19-2477; Rev 1; 11/03
Low-Voltage Analog Temperature Sensor in an SC70 Package
General Description
The MAX6613 is a low-power analog precision analog output temperature sensor in a tiny 5-pin SC70 package. The MAX6613 operates over a supply voltage range of 1.8V to 5.5V, with a typical current consumption of only 7.5A. It is particularly well suited for portable applications where minimizing battery cost and maximizing useful battery life are crucial. The MAX6613 provides an analog voltage output proportional to temperature. Accuracy is 1.3C (max) over a range of TA = 0C to +50C and 2.0C (max) from TA = -20C to +80C. Self-heating effects are negligible due to the low current consumption of the part. Unlike many analog temperature sensors, the MAX6613 is stable with any capacitive load from 0pF to 1000pF, providing broad flexibility in board-level design. The operating temperature range varies with the voltage supply. The MAX6613 can be used over a range of -55C to +130C with a supply voltage of 2.5V to 5.5V. For applications with a supply voltage of 1.8V, the MAX6613 can be used over a temperature range of +25C to +130C. o Supply Voltage from 1.8V to 5.5V o 1.3C Accuracy o Low Supply Consumption, 7.5A (typ) o Temperature Range -55C to +130C o SC70 Package o Pin Compatible to LM20
Features
MAX6613
Ordering Information
PART MAX6613MXK-T TEMP RANGE -55C to +130C PINPACKAGE 5 SC70-5 TOP MARK ADJ
Applications
Cellular Phones GPS Equipment Medical Instruments Battery Management Appliances Disk Drives Printers Fax Machines HVAC
Typical Application Circuit
VCC VCC
Pin Configuration
TOP VIEW
VCC VOUT 0.1F GND GND 100pF
MICROCONTROLLER ADC IN
N.C.
1
5
GND
GND 2
MAX6613
MAX6613
4 VCC
OUT 3
GND
SC70
________________________________________________________________ Maxim Integrated Products
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Low-Voltage Analog Temperature Sensor in an SC70 Package MAX6613
ABSOLUTE MAXIMUM RATINGS
(All Voltages Referenced to GND, Unless Otherwise Noted.) VCC to GND ..............................................................-0.3V to +6V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) OUT Short to GND......................................................Continuous Output Current ....................................................-1mA to +50mA ESD Protection (Human Body Model)................................2000V Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ...........246.9mW Operating Temperature Range .........................-55C to +130C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering 10s) ..................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = 1.8V to 5.5V, TA = -55C to +130C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS VCC = 2.7V, TA = 0C to +50C Temperature-to-Voltage Error (Notes 2, 3) VCC = 2.7V, TA = -20C to +85C VCC = 2.7V, TA = -55C to +100C VCC = 2.7V, TA = +100C to +125C VCC = 2.7V, TA = +125C to +130C Output Voltage Nonlinearity Sensor Gain (Temperature Sensitivity or Average Slope) Maximum Output Impedance Load Regulation TA = 0C TA = -55C to +100C TA = -20C to +100C (Note 3) 0 < IL < 16A, TA = -55C to +125C 0 < IL < 16A, TA = +125C to +130C 0 < IL < 16A, TA = -55C to +125C 0 < IL < 16A, TA = 125C to 130C TA = -20C to +130C, VCC 5.5V Supply Sensitivity (Note 3) Quiescent Current Capacitive Load Long-Term Stability Temperature Coefficient of Supply Current Power-Down Supply Current VCC < 0.8V IQ TA = -55C to -20C, VCC 4.5V TA = -55C to -20C, VCC 5.5V No load No sustained oscillations for capacitive loads in this range (Note 4) TA = room temperature for 1000hr (Note 4) 0 0.1 15 0.1 1 1 1 7.5 13 1000 A pF C nA/C A -10.98 MIN -1.3 -2 -2.4 -2.8 -3.1 1.8455 0.4 -11.23 -11.47 160 300 -2.5 -4.8 3.3 4.7 mV/V TYP MAX +1.3 +2 +2.4 +2.8 +3.1 V % mV/C mV C UNITS
Note 1: Note 2: Note 3: Note 4:
All parameters tested at room temperature. Values through temperature limits are guaranteed by design. VOUT = -0.0000022 T2 - 0.0115 T + 1.8639 (T = temperature in degrees Celsius). Guaranteed by design to 3 sigma. Guaranteed by design.
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Low-Voltage Analog Temperature Sensor in an SC70 Package MAX6613
Typical Operating Characteristics
(RL = , TA = +30C, unless otherwise noted.)
OUTPUT VOLTAGE vs. TEMPERATURE
2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 TEMPERATURE (C) 1.510 1.508 1.506 1.504 1.502 1.500 1.498 1.496 1.494 1.492 1.490 1.488 1.486 1.484 1.482 1.480
MAX6613 toc01
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX6613 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
9 8 SUPPLY CURRENT (A) 7 6 5 4 3 2 1 0
MAX6613 toc03
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OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
1.0
2.0
3.0
4.0
5.0
6.0
0
1.0
2.0
3.0
4.0
5.0
6.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX6613 toc04
STEP RESPONSE FROM +25C TO +125C
MAX6613 toc05
10.0 9.5 9.0 SUPPLY CURRENT (A) 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 VCC = 2.7V VCC = 5V VCC = 3.3V
1.55V
VOUT
200mV/div
430mV
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
1s/div
Pin Description
PIN 1 2 3 4 5 NAME N.C. GND OUT VCC GND FUNCTION No Connection. Must be connected to ground or left floating. Ground. Should be connected to pin 5. May be left floating, if desired. Voltage Output Supply Voltage. Bypass to GND with a 0.1F capacitor. Ground
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Low-Voltage Analog Temperature Sensor in an SC70 Package MAX6613
Table 1. Linear and Quadratic Output Equation
PARAMETER SYMBOL CONDITIONS VCC = 2.7V, TA = -55C VCC = 2.7V, TA = -40C VCC = 2.7V, TA = -20C VCC = 2.7V, TA = 0C Temperature Error Based on: OUT = 1.8639 - 0.0115 Temp (Note 4) VCC = 2.7V, TA = +20C VCC = 2.7V, TA = +40C VCC = 2.7V, TA = +60C VCC = 2.7V, TA = +85C VCC = 2.7V, TA = +100C VCC = 2.7V, TA = +125C VCC = 2.7V, TA = +130C VCC = 2.7V, TA = -55C VCC = 2.7V, TA = -40C VCC = 2.7V, TA = -20C VCC = 2.7V, TA = 0C VCC = 2.7V, TA = +20C Temperature Error Based on: OUT = 1.8639 - 0.0115 Temp 0.00000388 Temp2 (Note 4) VCC = 2.7V, TA = +30C VCC = 2.7V, TA = +40C VCC = 2.7V, TA = +50C VCC = 2.7V, TA = +60C VCC = 2.7V, TA = +85C VCC = 2.7V, TA = +100C VCC = 2.7V, TA = +125C VCC = 2.7V, TA = +130C MIN 2.06 1.19 0.55 0.35 -0.37 -1.32 -2.02 -2.32 -2.78 -3.11 -3.37 1.08 0.67 0.42 0.35 -0.49 -0.95 -1.81 -1.93 -3.11 -4.51 -5.77 -7.74 -8.35 TYP MAX 6.57 5.73 4.36 2.85 +2.15 +1.61 +1.92 +1.66 +2.01 +2.54 +2.90 5.76 5.33 4.28 2.85 +1.99 +1.53 +1.05 +0.54 +0.67 -0.74 -1.28 -2.52 -2.58 C C UNITS
Detailed Description
The MAX6613 analog output temperature sensor's output voltage is a discrete function of its die temperature. The maximum supply current is 13A, and the supply voltage range is from 2.5V to 5.5V for the -55C to +130C temperature range, or 1.8V to 5.5V for the +25C to +130C temperature range.
Therefore: T = (1.8455 - VOUT) / 0.01123V
Compatibility with Other Temperature Sensors
The MAX6613 can be used to replace temperature sensors using other output algorithms. Table 1 provides information for a linear and quadratic output equation. Contact the factory for performance information about another equation.
Transfer Function
The temperature-to-voltage transfer function is approximately linear and can be described by the quadratic equation: VOUT = -0.0000022 T2 - 0.01105 T + 1.8455V In many cases, a linear approximation can be applied: VOUT = -0.01123 T + 1.8455V where T is the die temperature of the MAX6613 in C.
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Low-Voltage Analog Temperature Sensor in an SC70 Package
Applications Information
Sensing Circuit Board and Ambient Temperature
A temperature sensor IC like the MAX6613 that senses its own die temperature must be mounted on, or close to, the object whose temperature it is intended to measure. Because there is a good thermal path between the package's metal lead and the IC die, the MAX6613 can accurately measure the temperature of the circuit board to which it is soldered. If the sensor is intended to measure the temperature of a heat-generating component on the circuit board, it should be mounted as close as possible to that component and should share supply and ground traces (if they are not noisy) with that component where possible. This optimizes the thermal connection from the component to the sensor. The thermal path between the plastic package and the die is not as good as the path through the lead, so the MAX6613, like all temperature sensors in plastic packages, is less sensitive to the temperature of the surrounding air than to the temperature of its leads. It can be successfully used to sense ambient temperature if the circuit board is designed to track the ambient temperature. As with any IC, the wiring and circuits must be kept insulated and dry to avoid leakage and corrosion, especially if the part is operated at cold temperatures where condensation can occur. The change in die temperature introduced by the part due to self-heating is negligible.
MAX6613
Chip Information
TRANSISTOR COUNT: 307 PROCESS: BiCMOS
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Low-Voltage Analog Temperature Sensor in an SC70 Package MAX6613
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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